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Re:CA Root expired on 30 May 2020 by pixmin on Saturday May 30, 2020 @04:34PM (#23364446)
Everything is fine with PKI and SSL certificates. It was a bug in OpenSSL 1.0.1 / 1.0.2 in dealing with two times cross-signed root CA. It is fixed in 1.1.1, but these older versions are still default on RHEL6/RHEL7/Centos6/Centos7 and even Ubuntu16.04.

I think a large portion of online communications have been affected today.

Re:CA Root expired on 30 May 2020 by josephcsible on Sunday May 31, 2020 @03:47PM (#23372110)
It's really ironic that only "stable" distros were affected by this, and that distros with software closer to bleeding-edge worked fine through it.